D’Addario EJ12-3D 80/20 Bronze Acoustic Strings 13-56 . EJ12 is a medium gauge 80/20 Bronze set that offers heavier gauges for increased volume and projection. 80/20 Bronze, the original acoustic alloy introduced to by John D’Addario Sr. and John D’Angelico in the 1930s is a popular alloy for recording due to their crisp, deep and projecting tone and appeal to many traditionalists and vintage enthusiasts for their historical significance.
